

Katara and Sokka fly in on Appa to save Aang from the Fire Nation. Prince Zuko attacks the Southern Water Tribe seeking to capture the Avatar, Aang.

Meanwhile, his unfreezing attracts the attention of the Fire Nation's Zuko intent on capturing him. After Katara frees him, she discovers that he is an airbender and the siblings take him to their home village in the Southern Water Tribe. Sokka and Katara, two teenage siblings living in the South Pole, discover Aang and his pet flying bison, Appa, trapped in an iceberg.

However, they must evade a critical foe, Prince Zuko of the Fire Nation, who wants to capture Aang. Sokka and his sister Kya (later renamed Katara), must travel the world to find masters for Aang, who is the Avatar. " Unaired pilot" (not part of continuity) The original pilot episode never aired but can be seen on the sixth disc of The Complete Book 1 Collection. The final two chapters comprise the season finale. The first two chapters comprise the series premiere. Episodes Book One: Water Main article: Book One: Water
